Can 12,000 btu portable AC be used w/ old 30A main fuse electrical system?

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The fuses may be the original problem. I suggest wiring around those pesky troublemakers.

JUST KIDDING!

But an 8k winder shaker may not pull much more juice than an old 5k, and it can throw air further. That is important in winder shaker selection. Of course, you might have to miss an episode of "THE LOVE BOAT" , but that is prolly not a problem for you as you seem to have found the perfect "LOVE SHACK" anyway.

And remember these words young man:

"A fire extinguisher in hand is better than, well if there was a fire or something I guess".

Never forget it.

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The fuses may be the original problem. I suggest wiring around those pesky troublemakers.

JUST KIDDING!

But an 8k winder shaker may not pull much more juice than an old 5k, and it can throw air further. That is important in winder shaker selection. Of course, you might have to miss an episode of "THE LOVE BOAT" , but that is prolly not a problem for you as you seem to have found the perfect "LOVE SHACK" anyway.

And remember these words young man:

"A fire extinguisher in hand is better than, well if there was a fire or something I guess".

It's not uncommon for garden style apt buildings with 30A or 40A mains supplying a 4-8 circuit subpanel in the apt. This was common in the 50-60's and are prevalent today. I would have a qualified electrician check to see if you have sufficient room to add an additional circuit to feed the new unit. Article 210.23(A)(1) allows cord and plug devices not fastened in place to exceed 80% of the the branch circuit rating. a 1500 W device will draw 12.5 amps which is 1/2 an amp greater then the 12 amps allowed on a 15 a circuit. If the branch circuit is rated for 20 amps you would probably be ok, but if that circuit also feeds another appliance you may have problems. Call an electrical contractor that gives free estimates and get your question answered for a safe installation.